Well...this is where basic human psychology takes over.  Back when I was had my psychology practice I did some treating of "problem gamblers."  (I did not treat addicts.)  LOTS, I repeat, LOTS of people got into a real funk, or depression, over winning $500, $1000, PLUS and then putting it all right back into the machine.  The fact you walked away with a majority of your winnings is actually a good sign!